MARINE MOLLUSCA OF TgE UNITED STATES. 27 



Subgenus Trophon, Montfort. 



Shell fusiform, Tarices numerous, lamelliform or laciniated; 

 spire prominent ; aperture ovate ; canal open, usually turning to 

 the left ; columella smooth, arcuated. 



These animals inhabit deep water in the Arctic Seas ; they are 

 distinguished from the typical Fusidse by their smaller size and 

 lamellar varices. 



1. T. truncatus, Strom. Fig. 39. 



(Buccinum.) Norsk. Vid. Selsk. Skr., iv. 369, t. 16, f. 26. 

 Trophon clathratus, Forbes & Hanley, Brit. Moll., iii. 436, t. Ill, f. 1, 2. 



(not Murcx clathratus, Linn.) 

 Murcx Bamffius (part.), Donovan, Brit. Shells, v. 169, f. 2. 



Shell small, brownish, with six rounded whorls ornamented with 

 numerous sharp lamellar longitudinal ribs ; aperture rounded, 

 columella arcuated, canal turned to the left. 



Length 13, diam. 6 mill. 



Maine, nortJiicards ; England. 



2. T. scalariformts, Gould. Fig. 40. 



(Eusus.) Silliman's Journ. Sci., xxxviii. 197. 

 Murex Bamffius (part.), Donovan, Brit. Shells, v. t. 169, f. 1. 



. Shell reddish-brown ; whorls seven, convex, with deep sutures ; 

 fifteen to twenty blade-like ribs disposed longitudinally on the 

 surface ; aperture rounded, canal slightly turned to the left. 



Length 43, diam. 20 mill. 



Massachusetts, northwards. 



Larger, with one more whorl than T. truncatus. 



3. T. muricatus, Montagu. Fig. 41. 



{Murex.) Test. Brit. 262, t. 9, f. 2. 



Shell small, yellowish or white; whorls seven, very convex; 



with ten conspicuous ribs crossed by elevated revolving lines, 



canal long and straight. 



Length 17, diam. 7 mill. 



Massachusetts, Europe. 



Family BUCCINID^]. 



Shell notched in front; or with the canal abruptly reflected, 

 producing a kind of varix on the front of the shell. Carnivorous. 



Synopsis of Genera. 

 Shell ovate, few-whorled, with a corneous epidermis ; whorls ventricose ; 

 aperture large, oval, emarginate in front ; canal wide, truncated, dorsally 



